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<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
	*{
	
		font-family: sans-serif;

	}
	</style>
</head>
<body>
	<h1>
		first
	</h1>
	<p>i am first</p>
	<h2>
		second
	</h2>
	<p>i am john</p>
	<h3>第三</h3>
	<p>i am tommy</p>
	<h4> 第四</h4>
	<p>i am jackson</p>
</body>
</html>